Timepiece with simplified exterior parts

Abstract

A timepiece including a ring (6) which assures a quadruple function: that of a water-tight packing between the crystal (1) and the ring; that of securing the caseband (3) to the ring; that of a casing ring for the movement (5) and finally that of securing the back cover to the ring. To this effect the caseband exhibits a cylindrical internal wall (4) entirely overlaid by the ring, said ring exhibiting a first accommodation (8) in which the crystal is engaged, a second accommodation (10) in which the movement is engaged and a lower zone (11) including means (18, 19) for securing the back cover.

What I claim is: 
     
       1. A timepiece including a crystal, a back cover and a caseband exhibiting on its whole height an internal surface engendered by a straight line moving parallel to itself along a circle, the crystal, the back cover and the caseband together defining a case intended to receive a movement provided with display means, a ring arranged between, on the one hand, the internal surface of the caseband which it overlays entirely, and on the other hand, the crystal and the movement, said ring including an upper zone exhibiting a first accommodation in which at least the crystal is engaged, said crystal compressing the material forming the ring against the caseband in order to assure at the same time a moisture tight closure between the crystal and said ring and the securing of said ring onto the caseband, a middle zone exhibiting a second accommodation in which the movement is engaged, said ring serving as a casing ring for said movement, and a lower zone extending beyond said internal surface toward said back cover, said lower zone including means for securing the back cover to said ring at said lower zone. 
     
     
       2. A timepiece as set forth in claim 1 wherein a flange is additionally engaged in the first accommodation in order to assure a predetermined space between the crystal and a dial forming part of said display means. 
     
     
       3. A timepiece as set forth in claim 1 wherein the lower zone further includes a third accommodation in which a packing is housed in order to assure a moisture tight closure between the back cover and said ring. 
     
     
       4. A timepiece as set forth in claim 1 wherein said means for securing the back cover include a snap formed in the outer periphery of said lower zone and an edge on said back cover arranged and adapted to fasten onto said snap. 
     
     
       5. A timepiece as set forth in claim 4 wherein the bottom of the caseband rests on the edge provided on the back cover. 
     
     
       6. A timepiece as set forth in claim 1 wherein said means for securing the back cover include threadings arranged in said lower zone in which are engaged screws passing through holes provided in the back cover. 
     
     
       7. A timepiece as set forth in claim 6 wherein the bottom of the caseband rests on a projection provided in the periphery of the second circle. 
     
     
       8. A timepiece including a crystal, a back cover and a caseband exhibiting a cylindrical internal wall, the crystal, the back cover and the caseband together defining a case intended to receive a movement provided with display means, a ring arranged between, on the one hand, the internal wall of the case band which it overlays entirely, and on the other hand, the crystal and the movement, said ring including an upper zone exhibiting a first accommodation in which at least the crystal is engaged, said crystal compressing the material forming the ring against the caseband in order to assure at the same time a moisture tight closure between the crystal and said ring and the securing of said ring onto the caseband, a middle zone exhibiting a second accommodation in which the movement is engaged, said ring serving as a casing ring for said movement, and a lower zone emerging from the caseband, said lower zone including means for securing the back cover to said ring, said ring including the combination of first and second circles bound to one another, the first circle being formed of plastic material and arranged to provide said first and second accommodations, the second circle being formed of metal and at least partially occupying said lower zone, said means for securing the back cover to said ring being arranged in said second circle. 
     
     
       9. A timepiece as set forth in claim 8 wherein the combination of said first and second circles is obtained by overmoulding of said first circle onto said second circle. 
     
     
       10. A timepiece as set forth in claim 8 wherein said means for securing the back cover include a snap formed in the periphery of the second circle and an edge on said back cover arranged and adapted to fasten onto said snap. 
     
     
       11. A timepiece as set forth in claim 10 wherein the bottom of the caseband rests on the edge provided on the back cover. 
     
     
       12. A timepiece as set forth in claim 8 wherein said means for securing the back cover include threadings arranged in the second circle in which are engaged screws passing through holes provided in the back cover. 
     
     
       13. A timepiece as set forth in claim 12 wherein the bottom of the caseband rests on a projection provided in the periphery of the second circle. 
     
     
       14. A timepiece including a crystal, a back cover and a caseband exhibiting a cylindrical internal wall, the crystal, the back cover and the caseband together defining a case in which is mounted a movement provided with display means, a ring arranged between, on the one hand, the internal wall of the caseband which it overlays entirely, and on the other hand, the crystal and the movement, said ring including an upper zone exhibiting a first accommodation in which at least the crystal is engaged, said crystal compressing the ring against the caseband to provide a moisture tight closure between the crystal and said ring and to secure said ring onto the caseband, a middle zone exhibiting a second accommodation in which the movement is engaged, said ring serving as a casing ring for said movement, and a lower zone extending beyond the caseband toward the back cover, said lower zone including mans for securing the back cover to said ring, and said cylindrical internal wall having a constant diameter throughout the height of said caseband in a direction perpendicular to said crystal.